US2252582A - Reinforcing means for lamp shades - Google Patents

Description

Aug. 12, 1941. E, W Z 2,252,582

REINFORCING MEANS FOR LAMP SHADES Filed March 4, 1939 INVENTOR.

ATTORNEY.

Eu G'ENE SGHWARZ Patented Aug. 12, 1941 REINFORCING MEANS FOR LAMP SHADES Eugene Schwarz, Alexandria, Ind, assignor to The Mantle Lamp Company of America, Chicago, 111., a corporation of Illinois Application March 4, 1939, Serial No. 259,765

8 Claims.

This invention pertains to lamp shades for use with lamps generally, and it includes :a construction by which reinforcing rings or members may be employed with the shade material, to hold the shade material in desired shape, without attaching the reinforcing means or members to the shade material. More specifically, the invention provides for forming retaining grooves in the upper and lower edge portions of the shade material, to constitute retaining seats for rings of suitable stiffening material, so that the rings will impart to the shade material their own conformation, and afford a substantial reinforcement for the ends of the shade material.

The invention is applicable to any shade material that is sufiiciently self-sustainnig to carry the grooves referred to, in such a manner that the grooves will retain their conformation in the ordinary usage to which the shade is put, whether the shade material is vsufficiently substantial to otherwise retain its form or not. Examples of suitable material 1 are parchment paper, sheet Celluloid and stiffened fabric. With shade material of the kind referred to which is self-sustaining, as far as the reinforcing grooves are concerned, the stiffeningor reinforcing members may conveniently consist of rings of metal or other suitable material, constructed to closely fit the grooves, said rings in some cases being insertable into the grooves by providing expansion joints in the rings and constructing the rings so that they tend to increase in size when unrestrained, although in other cases solid or continuous rings of metal or other suitable material may be used and inserted into the grooves of the shade material, by springing the shade material around each ring at one or more points; The essential feature of the invention is that the reinforcement is effected by a close and preferably a pressure'engagement of the reinforcing member with a groove in the shade material, said groove being so conformed that the reinforcingmember is positively and snugly retained in the groove against displacement for any usage to which the shade may ordinarily be subjected, Without the use of any additional retaining means whatsoever.

In case it is desired to ornament the reinforced ends of the shade, strips of finishing material may be employed, which cover the groove portions and also the reinforcing members, but any such ornamentation is not relied upon, nor does t substantially contribute in holding the reinforcing members in" the grooves referlfld to as being formed in the shade material.

The invention will be best understood by reference to the accompanying drawing illustrating a preferred embodiment thereof, in which:

Fig. 1 illustrates a shade in accordance with the invention, in vert cal, central, sectional view,

Fig. 2 is a horizontal, sectional View through the construction, taken along the line 22 in Fig. 1,

Fig. 3 is a horizontal, sectional View through the construction, taken along the line 3- -3 in Fig. 1, a

Fig. 4 is a plan view of one of the reinforcing rings or members in freed condition when removed from the shade, Q

Fig. 5 is a vertical, sectional View of a part of the construction shown in Fig. 1', taken along the line 5-5 in Fig. 1,

Fig. 6 is a longitudinal, sectional view to an enlarged scale, of the expansion joint used with the reinforcing member illustrated in Fig. 4, and

Fig, 7 shows in a view similar to Fig. 3, and to a reduced scale, a modified construction of the reinfoncing rings. 1

Similar numerals refer to similar throughout the several views.

Asshown in Fig. 1, the shade consists of a sheet of material I!) having a conical conformation of small taper, and provided with grooved end portions Illa and lflb containing reinforcing rings II and 12. The upper ring has secured to: it, a spider or supporting wires I3- for engaging a lamp or other support to hold the shade in desired position whenin use. The sheet ma-v terial I 0 is suificiently self-sustaining so that grooved portions may be formed therein and retain their conformation after the forming operation, as a result of which said grooved portions will have stable. engagement with the reinforcing'rings or members II and [2 after they are located in saidgrooved portions. The material of each of the grooved portions extends substantially half way around the side of the corresponding one of the reinforcing rings or members H and I2, as a result of which it is not possible to insert the ring into the grooved portion or remove it therefrom, without either changing thesize of the ring or springing part of the grooved portion to slip it over thering.

With the construction illustrated in the draw-- ing, the ring H as shown in Fig. 2,- is provided with portions Ila and Nb at its ends which are of reduced diameter, the portion Iiwcarrying and having secured thereto a sleeve member l4, andthe end portion Nb of the "ring being a sliding lit in the other end portion of said sleeve.

parts The ring II is preferably made of resilient material having a substantial spring action, for example spring metal, and is so conformed that when unrestrained, it is substantially larger in diameter than the grooved portion Illa in which it is to be retained. To mount the ring I I in the groove Illa, the end portion Ilb is inserted in the sleeve I4 and the ring is compressed until it will slip into the grooved portion Ida, and the ring is then released so that its expansive tendency will press it firmly into the grooved portion IIla, thereby imparting to the corresponding end of the shade, the general conformation of the ring II. The ring I2, as shown in Fig. 3, is similarly formed to engage the grooved portion Ib, said ring I2 having end portions I2a and I2b of reduced diameter and provided with a sleeve I which is secured to the ring portion I2a, the other end of the sleeve being a sliding fit on the end portion IZb of the ring, and the ring being constructed and operating in connection with the grooved portion I01), as above described for the ring II and the grooved portion "la.

The ring I2 is illustrated in Fig. 4 in its free or expanded condition removed from the shade, to show the compression required to place the ring in the condition illustrated in Figs. 1 and 3, so that the expansive tendency of the ring will firmly hold it in the grooved portion Ifib and mpart the general conformation of the ring to the corresponding portion of the shade. The extent to which the grooved portion Iflb embraces the ring I2 is illustrated in Fig. 5, and the relation of the end portions I2a and I21) of the ring I2 to the sleeve I5, when the ring is in position in the shade, is illustrated in Fig.6. I

Where the shad-e material is sufficiently resilient to permit it, the reinforcing rings may be solid andwithout joints, as shown in Fig. '7 for the ring I20, and maybe forced into engagement with the grooved portions'of the shade by stretching the edges of the grooved portions overjthe rings. The structure illustrated in Fig. 7 has the same appearance in vertical central sectional view as illustrated in Fig, 1, and it will be understood that both the upper and lower rein forcing rings of the complete structure may be of the construction illustrated for the ring I2c in Fig. 7. It will be observed that the essential feature of the invention is that the shade material shall be grooved cincumferentially and that it shall have tight engagement with a reinforcing ring or member holding the shade material in the conformation of said ring or member, as a result of the interaction between the grooved portion and the reinforcing ring or member tending to firmly press the two parts together, regardless of whether the grooved portion and the reinforcing ring or member are formed as specifically described, or otherwise.

If desired, the shade may be used without ornamentation, or, if preferred, the grooved portions of the shade may be ornamented by the use of additional strips or tapes of ornamental material which may, if desired, cover the grooved portions and also the reinforcing rings or members, but if so used, the ornamentation need form no part of the shade reinforcement and the ornamentation further need not be depended upon to hold the reinforcing rings or members tightly in engagement with the grooved portions of the shade. Thus the invention provides a simple and inexpensive meansfor imparting stability to Shade material that otherwise would not have sufiicient stiffness to maintain it in a desired general conformation, although small areas of the shade material might have the requisite sta bility to positively form and maintain the grooved portions referred to. It is to be understood that the terms shade material, formed sheet of shade material and stable shade materia used throughout the specification and appended claims, comprehend and include paper, parchment, Celluloid, stiffened fabric and similar sheet material.

While I have shown my invention in the particular embodiment above described, it will be understood that I do not limit myself thereto as I may employ equivalents thereof without departing from the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In a shade construction, the combination of a formed sheet of shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a groove formed in one of its end portions with upper and lower edge portions of different sizes than the bottom of said groove, said groove having a wall of a single thickness of said sheet, and a resilient shaping ring in said groove having a radial form desired for the shade, and pressing tightly and directly against the bottom surface thereof and held in said groove by the upper and lower edge portions of said groove, whereby the desired radial form is imparted to said formed sheet by said ring.

2. In a shade construction, the combination of a formed sheet of shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a groove formed in one of its end portions with upper and lower edge portions of different sizes than the bottom of said groove, said groove having a Wall of a single thickness of said sheet, and a resilient shaping ring in said groove having a radial form desired for the shade, and pressing directly against the bottom surface thereof and held in said groove by the upper and lower edge portions of said groove, whereby the desired radial form is imparted to said formed sheet by said ring, said ring comprising a metallic wire held in stressed condition in said groove by the spring tendency of said ring.

3. In a shade construction, the combination of a formed sheet of stable shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a circumferential groove formed around its end, said groove having a wall of a single thickness of said sheet, a shaping ring in said groove pressing tightly and directly against the bottom thereof, said ring comprising a metallic wire held in stressed condition in said. groove by the spring tendency of said ring, and a sleeve holding the end portions of said ring in alignment with each other and having sliding engagement with said ring, said sleeve having an outer diameter substantially equal to the diameter of the material of said ring outside of said sleeve.

4. In a shade construction, the combination of a formed sheet of shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a groove formed in one of its end portions with upper and lower edge portions of different sizes than the bottom of said groove, said groove having a wall of a single thickness of said sheet, and a shaping ring in said groove and pressing directly against the bottom surface thereof and held in said groove by the upper and lower edge portions of said groove, said ring comprising a metallic wire held in stressed condition in said groove by the spring tendency of said ring, and a sleeve holding the end portions of said ring in alignment with each other and having sliding engagement with said ring, said sleeve having an outer diameter substantially equal to the diameter of the material of said ring outside of said sleeve.

5. In a shade construction, the combination of a formed sheet of shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a groove formed in one of its end portions with upper and lower edge portions of different sizes than the bottom of said groove, said groove having a wall of a single thickness of said sheet, a resilient shaping ring in said groove having a radial form desired for the shade, and pressing tightly and directly against the bottom surface thereof and held in said groove by the upper and lower edge portions of said groove, whereby the desired radial form is imparted to said formed sheet by said ring, and a supporting spider connected with said ring.

6. In a shade construction, the combination of a formed sheet of stable shade material of such stiffness as to retain its axial conformation unaided and to be flexible radially, said sheet having a circumferential groove formed around its end, said groove having a wall of a single thickness of said sheet, a shaping ring in said groove pressing tightly and directly against the bottom thereof, said ring comprising a metallic wire held in stressed condition in said groove by the spring tendency of said ring, a sleeve holding the end portions of said ring in alignment with each other and having sliding engagement with said ring, said sleeve having an outer diameter substantially equal to the diameter of the material of said ring outside of said sleeve, and a supporting spider connected with said ring.

7. In a shade construction, the combination of a formed sheet of stable shade material having a circumferential groove formed around its end, said groove having a wall of a single thickness of said sheet, and a metallic shaping ring in said groove and pressing tightly and directly against the bottom thereof, said shade material being sufiiciently rigid axially of the shade to support the shade in that direction and being sufficiently resilient to require radial reinforcement, the resilience of the shade material beingsu-ificient to be distended at the edge of the circumferential groove to pass over the ring in assembling the latter in place in the groove and to hold the ring in the groove for the assembled condition of the shade construction.

8. In a shade construction, the combination of a formed sheet of stable shade material having a circumferential groove formed around its end, and a rigid metallic shaping ring in said groove and pressing tightly against the bottom thereof, said shade material being sufficiently rigid axially of the shade to support the shade in that direction and being sufficiently resilient to require radial reinforcement, the resilience of the shade material being sufficient to be distended at the edge of the circumferential groove to pass over the ring in assembling the latter in place in the groove and to'hold the ring in the groove for the assembled condition of the shade construction, said ring being of solid and continuous construction.

EUGENE SCHWARZ.

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